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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6af33e8adf15e3d48cb18229d25a1c733c93ddea1ad21e640b8138a933be4b5' 
  AND token = '45IEdSy0lNpeETUHHvrClcKSNJcLfXvW8xV82BlKQ+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}